PySerial 非阻塞读取循环 [英] PySerial non-blocking read loop

问题描述

我正在读取这样的串行数据:

I am reading serial data like this:

connected = False
port = 'COM4'
baud = 9600

ser = serial.Serial(port, baud, timeout=0)

while not connected:
    #serin = ser.read()
    connected = True

    while True:
        print("test")
        reading = ser.readline().decode()

问题是它阻止了其他任何东西的执行，包括 Bottle py Web 框架.添加 sleep() 无济于事.

The problem is that it prevents anything else from executing including bottle py web framework. Adding sleep() won't help.

将 "while True"" 更改为 "while ser.readline():" 不会打印 "test"，这很奇怪，因为它在 Python 2.7 中工作.任何想法可能是错误的?

Changing "while True"" to "while ser.readline():" doesn't print "test", which is strange since it worked in Python 2.7. Any ideas what could be wrong?

理想情况下，我应该能够仅在可用时读取串行数据.每 1000 毫秒发送一次数据.

Ideally I should be able to read serial data only when it's available. Data is being sent every 1,000 ms.

推荐答案

放在单独的线程中，例如:

Put it in a separate thread, for example:

import threading
import serial

connected = False
port = 'COM4'
baud = 9600

serial_port = serial.Serial(port, baud, timeout=0)

def handle_data(data):
    print(data)

def read_from_port(ser):
    while not connected:
        #serin = ser.read()
        connected = True

        while True:
           print("test")
           reading = ser.readline().decode()
           handle_data(reading)

thread = threading.Thread(target=read_from_port, args=(serial_port,))
thread.start()

http://docs.python.org/3/library/threading

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